my first time doing flea market selling!? any tips?

Get lots of change. Tens, fives & singles.
Bring plastic bags.
Get yourself a small cooler with drinks and your lunch in it.
A tablecloth will always make your items look better.
If you are outside, wear a hat & use sunscreen. Maybe bring an umbrella or something that will give you shade.
Most people like to haggle over the price, but don't let them screw you over.
Check your prices before hand to see how much they're going for.
If you're using yellow sticky notes as price tags, write the item underneath the price. This will discourage dirtbags from trying to switch price tags with other items.
If you want the most for an item, put a higher price on the price tag with a line through it. Then put a lower price underneath it. This makes it look like you lowered the price for a quick sale.

I used to sell at the Golden Nugget Antique flea market in Lambertville, NJ. I stopped once they changed their policies & raised the table fees.

So how did you do?